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Collective behavior of soldier crab swarm in both ring- and round-shaped arenas

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Abstract

In study of collective behavior, though collective foraging behavior against surroundings is one of the most vivid examples about how animal group responses to external environment, relative experiment is rare. In this paper, we show an experiment with respect to collective foraging using a swarm of soldier crabs Mictyris guinotae, which live in the tideland and can form large swarms. We recorded the behaviors of soldier crab swarms with 10, 20, 30, 40 individuals in experimental arenas. Thanks to markers attached to crabs’ shells and image-processing software, we obtained time series of individuals’ position during 30 min. As a consequence, we found the soldier crabs form densely swarm to some extent in the ring-shaped experimental arena. Moreover, when we calculated the time between direction changes of the swarm, we found that it followed power-law distribution, containing very long moves. Such movement pattern is frequently found in foraging behavior of single animals. Our results, therefore, suggest that collective swarms show a type of foraging behavior as a single group.

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Author information

Authors and Affiliations

  1. School of Fundamental Science and Engineering, Waseda University, Shinjuku, Japan

    Hisashi Murakami, Takenori Tomaru & Yukio-Pegio Gunji

  2. Faculty of Engineering, Information and Systems, Tsukuba University, Tsukuba, Japan

    Takayuki Niizato

  3. Science & Technology Entrepreneurship Laboratory (e-square), Osaka University, Suita, Japan

    Yuta Nishiyama

  4. Faculty of Education, Shiga University, Otsu, Japan

    Kohei Sonoda

  5. Faculty of Textile Science and Technology, Shinshu University, Ueda, Japan

    Toru Moriyama

Authors
  1. Hisashi Murakami
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  2. Takenori Tomaru
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  3. Takayuki Niizato
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  4. Yuta Nishiyama
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  5. Kohei Sonoda
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  6. Toru Moriyama
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  7. Yukio-Pegio Gunji
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Correspondence to Hisashi Murakami.

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Murakami, H., Tomaru, T., Niizato, T. et al. Collective behavior of soldier crab swarm in both ring- and round-shaped arenas. Artif Life Robotics 20, 315–319 (2015). https://doi.org/10.1007/s10015-015-0232-y

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  • DOI: https://doi.org/10.1007/s10015-015-0232-y

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